These Staedtler Rasoplast Combi Erasers are perfect for erasing both ink and lead. The blue section of the erasers is a great way to remove mistakes in ink from paper, and the white end will erase lead. They feature a sliding sleeve for convenient use and have minimal crumbling.These erasers will erase both lead and ink from paper.They offer high quality erasing every time.They feature minimal crumbling.The sliding sleeve makes them convenient to handle and use.